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If the distance is decreased by 4 times, the force of gravity between the two bodies is one-eighth as weak as before.

Explanation:

The force of gravity between two bodies depends on the mass and distance. But we will focus on distance since that's what the question asks. Therefore, the force of gravity increases as distance between the bodies decreases.

The gravitational force between two bodies is inversely proportional to the square of the distance between them.

So if the distance is divided by 4, the force is multiplied by 16.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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